feat: agent 0.12.12 (curated OpenRouter top 10, wizard redesign, fix dropdown wipe)

[protosphinx]

Summary

• OpenRouter dropdown is now a curated top 10, not the full 300+ catalogue. New CURATED_OPENROUTER_MODELS grouped into Frontier / Balanced / Fast / Specialized. Live fetch still runs so pricing + context chips stay accurate, but only curated slugs render as <optgroup>-labelled options. Custom slugs still work via config.json.
• Dropdown wipe bug fixed. Picking a model on OpenRouter used to get silently clobbered the moment the live /openrouter-models fetch resolved, because the async re-render passed the page-load-time ACTIVE_MODEL back to setOptions instead of the user's current pick. New selectionFor() helper reads modelSel.value on same-provider re-renders; a loadToken request-race guard also prevents a slow fetch landing after the user has already flipped providers.
• Wizard page redesigned for breathing room. 640px card, 40px/44px padding, provider + model unstacked into full-width rows, sectioned blocks with dividers, larger typography, custom chevron on <select>, actions row gets its own divider. Cramped 560px two-column layout is gone.

Test plan

• pnpm run typecheck clean
• pnpm run build clean
• node scripts/smoke-normalize-model.mjs still passes (23/23)
• curl http://127.0.0.1:4242/ against a throwaway $HOME preview returns the new HTML with CURATED_OPENROUTER, Frontier, selectionFor, loadToken, max-width: 640, and two .section blocks
• Real interaction check (user): dropdown no longer wipes on select; page looks less cramped

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